More cleanup

design.md

@@ -393,7 +393,7 @@ Only Server can create connections (using private constructor via friend access)
 #### Simple Synchronous Handler
 
 ```cpp
-class HttpHandler : public ConnectionHandler {
+class HttpHandler : ConnectionHandler {
 public:
   void on_data_arrived(std::string_view data, Connection& conn) override {
     // Parse HTTP request using connection's arena
@@ -410,7 +410,7 @@ public:
 #### Async Handler with WeakRef
 
 ```cpp
-class AsyncHandler : public ConnectionHandler {
+class AsyncHandler : ConnectionHandler {
 public:
   void on_data_arrived(std::string_view data, Connection& conn) override {
     // Get weak reference for async processing
@@ -429,7 +429,7 @@ public:
 #### Batching Handler with User Data
 
 ```cpp
-class BatchingHandler : public ConnectionHandler {
+class BatchingHandler : ConnectionHandler {
 public:
   void on_connection_established(Connection &conn) override {
     // Allocate some protocol-specific data and attach it to the connection
@@ -468,7 +468,7 @@ private:
 #### Streaming "yes" Handler
 
 ```cpp
-class YesHandler : public ConnectionHandler {
+class YesHandler : ConnectionHandler {
 public:
   void on_connection_established(Connection &conn) override {
     // Write an initial "y\n"